Analysis Methods for the Design of Special Concentrically Braced Frames with Three or More Tiers for In-Plane Seismic Demand
Publication: Journal of Structural Engineering
Volume 143, Issue 4
Abstract
This paper presents two analysis methods for the in-plane seismic response of steel multitiered braced frames (MT-BFs) with three or more tiers: (1) a substructuring technique; and (2) a stiffness analysis method. Both methods are consistent with the 2010 AISC Seismic Provisions and have been developed to estimate column flexural demands and tier drifts to prevent column instability and to mitigate concentration of tier drifts as well as premature brace failure under seismic loading. Both methods account for the progression of brace tension yielding along the frame height as observed in MT-BFs. The substructuring technique is simpler and is limited to regular frames, as it assumes a predefined yielding sequence. The stiffness analysis–based method is more rigorous and can predict the actual frame nonlinear response. It can be applied to both regular and irregular MT-BF configurations. The application of the methods is illustrated for two five-tiered special concentrically braced frame examples. Nonlinear response history analysis is performed to validate the proposed methods for the frames studied.
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Acknowledgments
Funding from the Natural Sciences and Engineering Research Council (NSERC) of Canada is acknowledged. The authors express their appreciation to Larry Fahnestock of the University of Illinois at Urbana-Champaign, Christopher Stoakes of the University of Iowa, and to the members of AISC Task Committee 9—Seismic Design for their most valuable input on this topic. The authors also wish to thank the reviewers for their cogent and constructive comments, which led to improve the quality and utility of the paper.
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Information
Published In
Journal of Structural Engineering
Volume 143 • Issue 4 • April 2017
Copyright
©2016 American Society of Civil Engineers.
History
Received: Sep 11, 2015
Accepted: Sep 12, 2016
Published online: Nov 18, 2016
Published in print: Apr 1, 2017
Discussion open until: Apr 18, 2017
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